My theory on why diffs. give way on recent modern Alfas
Although the talk is to change standard diffs on recent Alfas to Q2 because of potential diff. failures the stats seem to show that Australia has the most examples of this happening.
I reckon this is probably due to the high temperatures experienced here. In the General Alfa Discussion forum I started a thread where I mentioned that it was still winter here but the temperature today showing in my inboard gauge. got up to 42.5 degrees celsius.
You imagine having a V6 directly attached to a gearbox and diff. with a guard below and that is a recipe for disaster with the oils reaching incredible temperatures. I should have looked at the oil temperature guage today to see what it got up to. A friend with a Maserati can't use his air conditioning in summer here without the car overheating.
In Iraq a lot of breakdowns in tanks and other mechanical vehicles are due to the high ambient temperatures. Call me nuts but I reckon that there's a good chance that diff. failures are due to the oil breaking down from the heat. I know that people are saying that the diff design is poor but I think there's more to it.
There's an oil testing place in Melbourne and it would be interesting to see what the oil is like after a diff. failure. Hmmmmm??
Having said that I'm having my Q2 diff installed this week.